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diff --git a/pjlib/include/pj/assert.h b/pjlib/include/pj/assert.h
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+++ b/pjlib/include/pj/assert.h
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+/* $Header: /pjproject-0.3/pjlib/include/pj/assert.h 4     10/14/05 12:25a Bennylp $ */
+#ifndef __PJ_ASSERT_H__
+#define __PJ_ASSERT_H__
+
+/**
+ * @file assert.h
+ * @brief Assertion macro pj_assert().
+ */
+
+#include <pj/config.h>
+#include <pj/compat/assert.h>
+
+/**
+ * @defgroup pj_assert Assertion Macro
+ * @ingroup PJ_MISC
+ * @{
+ *
+ * Assertion and other helper macros for sanity checking.
+ */
+
+/**
+ * @hideinitializer
+ * Check during debug build that an expression is true. If the expression
+ * computes to false during run-time, then the program will stop at the
+ * offending statements.
+ * For release build, this macro will not do anything.
+ *
+ * @param expr	    The expression to be evaluated.
+ */
+#define pj_assert(expr)   assert(expr)
+
+
+/**
+ * @hideinitializer
+ * If #PJ_ENABLE_EXTRA_CHECK is declared and non-zero, then 
+ * #PJ_ASSERT_RETURN macro will evaluate the expression in @a expr during
+ * run-time. If the expression yields false, assertion will be triggered
+ * and the current function will return with the specified return value.
+ *
+ * If #PJ_ENABLE_EXTRA_CHECK is not declared or is zero, then no run-time
+ * checking will be performed. The macro simply evaluates to pj_assert(expr).
+ */
+#if defined(PJ_ENABLE_EXTRA_CHECK) && PJ_ENABLE_EXTRA_CHECK != 0
+#   define PJ_ASSERT_RETURN(expr,retval)    \
+	    do { \
+		pj_assert(expr); \
+		if (!(expr)) return retval; \
+	    } while (0)
+#else
+#   define PJ_ASSERT_RETURN(expr,retval)    pj_assert(expr)
+#endif
+
+/** @} */
+
+#endif	/* __PJ_ASSERT_H__ */
+